The best thing to do and it s the code in va is to put aluminum coil in between the wood and the concrete.
Pouring concrete against siding.
It is not a good idea.
It s never going to be a good idea to pour a concrete porch or set of stairs next to wood siding or structural framing.
You can but you should put expansion board there.
In addition when the concrete expand you want to.
I would advise locating a vinyl siding company and getting them to break some scraps that they ve laying around about an inch much higher than the concrete will be poured and as far out from the house as the scraps will go.
It is not a good idea.
Moisture can accumulate in concrete and then absorb into the wood and if this.
You will sometime have to remove the vinyl siding and tearing up the concrete will be expensive.